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()1,()Iwaswaitingatthebusstop.threebuseswentbyintheoppositedirection.A,UntilB,beforeC,whileD,After

题目详情
( )1,( ) I was waiting at the bus stop.three buses went by in the opposite direction.
A,Until B,before C,while D,After
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答案和解析
C 当……的时候